Type answer as whole number (no decimals, no units). ks: -
Help: Lecture 35, Ex. 35.2
1435
Avi measured an initial surface water salinity of 18 ppt, and predicted that, due to
mixing with bottom water, the surface salinity would increase at the constant rate of 2
ppt per hour. Kaila measured an initial bottom salinity of 30 ppt, and predicted the
bottom salinity would decrease at the constant rate of 1 ppt per hour. Assuming the
initial measurements were made at the same time, estimate how much time would
elapse before the surface and bottom salinities equal each other.
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the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.

i only know the sequence of arithmetic it adds the first is 5+4 then it goes up as it adds to then it is 9+5 then 14+6 then to 20+7 and so on. 5,9,14,20,27,35.

step-by-step explanation: